// 导出页面为PDF格式
import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'
export default{
    install (Vue, options) {//全局的函数
        Vue.prototype.getPdf = function () {
            var title = this.htmlTitle  //DPF标题
            html2Canvas(document.querySelector('#pdfHtml'), {
                allowTaint: true,
                taintTest: false,
                useCORS: true,
                //width:960,
                //height:5072,
                dpi: window.devicePixelRatio*4, //将分辨率提高到特定的DPI 提高四倍
                scale:4 //按比例增加分辨率
            }).then(function (canvas) {
                        let contentWidth = canvas.width
                        let contentHeight = canvas.height
                        let pageHeight = contentWidth / 592.28 * 841.89
                        let leftHeight = contentHeight
                        let position = 0
                        let imgWidth = 595.28
                        let imgHeight = 592.28 / contentWidth * contentHeight
                        let pageData = canvas.toDataURL('image/png', 1.0)
                        // let PDF = new JsPDF('', 'pt', 'a4')
                        // if (leftHeight < pageHeight) {
                        //     PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight)
                        // } else {
                        //     while (leftHeight > 0) {
                        //         PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
                        //         leftHeight -= pageHeight
                        //         position -= 841.89
                        //         if (leftHeight > 0) {
                        //             PDF.addPage()
                        //         }
                        //     }
                        // }
                        // PDF.save(title + '.pdf')
                        const creatDom = document.createElement('a')
                        document.body.appendChild(creatDom)
                        creatDom.href = pageData
                        creatDom.download = '测试报告'
                        creatDom.click()


                    }
            )
        }
    }
}
